Update README.md

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@@ -31,10 +31,11 @@ supported methods.
 
 If you want to use this module directly without browserify, install it:
 
-```
+```bash
 npm install buffer
 ```
 
+
 ## usage
 
 As mentioned before, when you `require('buffer')` or use the `Buffer` global in [browserify](http://github.com/substack/node-browserify), this module will automatically
@@ -42,7 +43,7 @@ be included in your bundle so you get a `Buffer` API that actually works in the
 
 If you're depending on this module explicitly, then require it like this:
 
-```
+```js
 var Buffer = require('buffer/').Buffer  // use the npm module, not the core module!
 ```